[sdiy] noise maker ...top octave IC

[Scott Gravenhorst]

Organs, pretty much.  These are a system of dividers that
produce the pitches of a 12 note equally tempered scale.
I have two here.  Many years ago I made a four voice
polyphonic synth with a 1 (one) megahertz microprocessor
and one of them.  It worked quite well, but lacked the
charm of an analog synth.  Portamento is not possible or 
at least not very easy to do with this sort of thing.
The part I used was MK50240, Mostek I think.  I keep thinking
about putting it back together since the micro still works,
circa 1978 I think (SWTPC 6800).


"Derek Holzer" <republikasleazka at hotmail.com> wrote:
>>Thomas Hudson wrote:
>>Another thing you might look for is the EGG circuit Paia had years
>>ago. Seem to remember someone on the list was resurrecting it.
>>Or did it use one of the long-gone top octave dividers?
>
>I've got one of these top octave ICs in my parts box, still in the wrapper. 
>I thought it was only good for building organs, so I didn't make any plans 
>for it. What are some of the other possibilities, in terms of sound 
>generators? Anybody got schematics?
>
>Derek
>
>PS... thanks to Rich for posting the hex-inverter theremin! What sort of 
>antenna is used?
>
>//  \\ \ \\  ///   / \\   \   \\\\ \
>\\       acoustic.space.lab       //
>http://acoustic.space.re-lab.net/lab
>///   / \\     \\\\ \ \\  ///     \\
>
>
>
>
>
>
>
>
>
>
>
>
>_________________________________________________________________
>Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
>

=========================================================  
- Government: The other religion.
- The media's credibility should always be questioned.
- Lambs who lie down with lions are lunch.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.GTE.NET/res0658s/TekLab_FatMan_WebSite/index.html